package com.atguigu.eduservice.service.impl;

import com.alibaba.excel.EasyExcel;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.entity.subject.OneSubject;
import com.atguigu.eduservice.entity.subject.TwoSubject;
import com.atguigu.eduservice.listener.SubjectExcelListener;
import com.atguigu.eduservice.mapper.EduSubjectMapper;
import com.atguigu.eduservice.service.EduSubjectService;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * <p>
 * 课程科目 服务实现类
 * </p>
 *
 * @author cs
 * @since 2021-02-08
 */
@Service
public class EduSubjectServiceImpl extends ServiceImpl<EduSubjectMapper, EduSubject> implements EduSubjectService {

    //添加课程分类
    @Override
    public void saveSubject(MultipartFile file, EduSubjectService subjectService) {
        try {
            //文件输入流
            InputStream in = file.getInputStream();
            //调用方法进行读取
            EasyExcel.read(in, SubjectData.class, new SubjectExcelListener(subjectService)).sheet().doRead();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public List<OneSubject> getAllOneTwoSubject() {
        //1.查询所有一级分类
        QueryWrapper<EduSubject> wrapperOne = new QueryWrapper<>();
        wrapperOne.eq("parent_id", "0");
        //List<EduSubject> onseSubjectList = baseMapper.selectList(wrapperOne);
        List<EduSubject> oneSubjectList = this.list(wrapperOne);

        //查询所有一级分类下的二级分类
        QueryWrapper<EduSubject> wrapperTwo = new QueryWrapper<>();
        wrapperTwo.ne("parent_id", "0");
        //List<EduSubject> onseSubjectList = baseMapper.selectList(wrapperOne);
        List<EduSubject> twoSubjectList = this.list(wrapperTwo);

        //创建list集合，用于存储最终封装数据
        List<OneSubject> result = new ArrayList<>();
        //封装一级分类
        for (int i = 0; i < oneSubjectList.size(); i++) {
            EduSubject eduSubject = oneSubjectList.get(i);
            OneSubject oneSubject = new OneSubject();
            /*oneSubject.setId(eduSubject.getId());
            oneSubject.setTitle(eduSubject.getTitle());*/
            BeanUtils.copyProperties(eduSubject, oneSubject);

            //在一级分类的循环里面遍历查询所有的二级分类
            //创建list集合封装每个一级分类的二级分类
            List<TwoSubject> twoResultSubjectList = new ArrayList<>();
            for (int j = 0; j < twoSubjectList.size(); j++) {
                EduSubject tSubject = twoSubjectList.get(j);
                if (oneSubject.getId().equals(twoSubjectList.get(j).getParentId())) {
                    TwoSubject twoSubject = new TwoSubject();
                    BeanUtils.copyProperties(tSubject, twoSubject);
                    twoResultSubjectList.add(twoSubject);
                }
            }
            //把一级下面所有的二级分类放到里面
            oneSubject.setChildren(twoResultSubjectList);
            result.add(oneSubject);
        }
        //封装二级分类
        return result;
    }
}
